1. a principal enemy; one’s chief or most important opponent

Examples

• Batman’s archenemy is the Joker.
• The two companies have been archenemies in the smartphone market for years.
• She considered her former business partner to be her archenemy after the betrayal.
• The superhero finally defeated his archenemy in the final battle.
• The detective spent decades trying to catch his archenemy, a master thief.
• In the story, the prince must face his archenemy to save the kingdom.